<!DOCTYPE html>
<html lang="en">
<head>
    <style>
        .kuangshen{
            color: #80007a;
        }
        .nihaoa{
            color: deepskyblue;
        }
    </style>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<h1 class="kuangshen">我是标题1</h1>
<h1 class="nihaoa">我是标题2</h1>
<h1>我是标题3</h1>
</body>
</html>